CN111633059B - Method for controlling pressing amount of roller type straightening machine based on plate shape characteristics - Google Patents

Method for controlling pressing amount of roller type straightening machine based on plate shape characteristics Download PDF

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CN111633059B
CN111633059B CN202010405766.3A CN202010405766A CN111633059B CN 111633059 B CN111633059 B CN 111633059B CN 202010405766 A CN202010405766 A CN 202010405766A CN 111633059 B CN111633059 B CN 111633059B
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straightening
unevenness
plate
roll
roller
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CN111633059A (en
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胡鹰
闫建云
程艳
王效岗
马立峰
徐杰
胡鹏
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Taiyuan University of Science and Technology
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
    • B21D1/02—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling by rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C51/00—Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses B21B - B21F

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Abstract

The invention provides a method for controlling the pressing amount of a roller type straightener based on plate shape characteristics, which comprises the following steps: obtaining the standard distance from the plate shape instrument to the surface of the plate andan actual distance; making a difference between the standard distance and the actual distance to obtain a plate unevenness value; taking the maximum value and the minimum value in the unevenness value of the plate as two end points of the unevenness interval; equally dividing the unevenness interval M, and drawing the measuring points with equal unevenness values into equal unevenness curves according to the unevenness values at the equally divided positions; determining the screw-down amount of the No. i straightening roll before correction according to a formula
Figure DDA0002491232910000011
Calculating the corrected rolling reduction of the No. i straightening roll; and controlling the rolling reduction of the straightening roll according to the equal unevenness curve as the characteristic of the plate type. The method of the invention can realize that the straightening roller dynamically applies corresponding rolling reduction according to the plate type characteristics during the straightening process.

Description

Method for controlling pressing amount of roller type straightening machine based on plate shape characteristics
Technical Field
The invention relates to the technical field of straightening processes, in particular to a method for controlling the pressing amount of a roller type straightening machine based on plate shape characteristics.
Background
At present, special metal plates such as tungsten, molybdenum, titanium, zirconium, neutron absorption plates, bimetal composite plates and other special metals are produced in the process of production due to the characteristics of the special metal plates: high strength, large brittleness, easy cracking and large difference of anisotropy; the product has multiple varieties and specifications, large span, variable production process and poor deformation consistency; poor production continuity, narrow controllable deformation window, serious plate shape defect and the like. In the straightening process, aiming at the characteristics and the distortion deformation characteristics of the plate, the targeted straightening is a problem to be solved urgently.
When the plate has defects, the unevenness value is no longer 0, namely the plate is no longer in a straight state. The traditional straightening process in the metallurgical industry is set to be more specific to the steel industry, and a special straightening process calculation method specific to special metal characteristics is lacked, so that the special metal plate straightening and pressing process in the industries has no specific effective calculation method, and plate cracking caused by over-large pressing or plate shape defects caused by insufficient pressing often occur. How to finish straightening and ensure the straightening quality under the conditions of ensuring the performance of the special plate such as no cracking and ensuring the surface quality of the plate, namely, under the conditions of smaller straightening force and single-pass straightening is a problem to be solved urgently.
Disclosure of Invention
Based on the above, it is necessary to provide a method for controlling the amount of pressing down of the roller straightening machine based on the plate type characteristics, so as to realize that the straightening rollers dynamically apply corresponding amount of pressing down according to the plate type characteristics during the straightening process.
In order to achieve the purpose, the invention provides the following scheme:
a method for controlling the amount of rolling reduction of a roller straightener based on plate shape characteristics, wherein the roller straightener comprises a plurality of upper row straightening rollers and a plurality of lower row straightening rollers, each straightening roller is arranged in parallel in the moving direction of a plate to be straightened, and the method for controlling the amount of rolling reduction comprises the following steps:
acquiring a standard distance and an actual distance from a plate type instrument to the surface of a plate;
making a difference between the standard distance and the actual distance to obtain a plate unevenness value;
selecting the maximum value and the minimum value from the unevenness values of the plates as two end points of an unevenness interval;
equally dividing the unevenness interval M, and drawing the measuring points with equal unevenness values into equal unevenness curves according to the unevenness values at the equally divided positions;
determining the screw-down amount of the ith straightening roller before correction, wherein the ith straightening roller is the ith straightening roller along the moving direction, i is 1,2,3,. N, N is the total amount of the straightening rollers, and when the ith straightening roller is the No. 1 or the No. N straightening roller, the screw-down amount is zero;
according to the formula
Figure BDA0002491232890000021
Calculating the corrected rolling reduction of the No. i straightening roll, wherein SiThe rolling reduction before correction of No. i straightening roll is shown, H represents the thickness of the plate, HiThe unevenness value of the plate corresponding to the equal unevenness curve where the No. i straightening roller is located is represented;
and controlling the rolling reduction of the No. i straightening roll by taking the equal unevenness curve as the characteristic of the plate type.
Optionally, the calculation of the rolling reduction before correction of the i-th straightening roller comprises:
according to the formula
Figure BDA0002491232890000022
Calculating the screw-down quantity S before the correction of No. i straightening rolli，S2The rolling reduction before correction of No. 2 straightening roll, SN-1The screw-down amount before correction of the No. N-1 straightening roll is determined, the No. i straightening roll is an upper row straightening roll, and in this case, i is 4,6, 8 … … N-3.
Optionally, the calculation of the rolling reduction before correction of the i-th straightening roller further includes:
according to the formula
Figure BDA0002491232890000023
Calculating the screw-down quantity S before the correction of No. i straightening rolliThe No. i straightening roll is a lower row straightening roll, and in the process, i is 3,5,7 … … N-2, Si-1And Si+1And correcting the pre-pressing amount for two upper straightening rolls adjacent to the No. i straightening roll respectively.
Optionally, the specific calculation formula of the rolling reduction before correction of the No. 2 and No. N-1 straightening rollers is as follows:
Figure BDA0002491232890000024
Figure BDA0002491232890000025
wherein σsDenotes yield strength, H denotes sheet thickness, E denotes modulus of elasticity, T denotes roll gap of straightening roll, n1、n2The respective multiples of the elastic modulus values of the No. 2 and No. N-1 straightening rolls are shown.
Optionally, the controlling the rolling reduction of the i-th straightening roller by using the equal unevenness curve as a characteristic of a plate type specifically includes:
judging the state of each equal-unevenness curve, wherein the states comprise a closed state, a semi-closed state and a fully-closed state;
drawing a standard line according to the state of the equal unevenness curve;
when the straightening roller gradually moves from the previous standard line to the next standard line according to the set straightening speed v, adjusting the pressing amount of the No. i straightening roller at the position to be the corrected pressing amount under the unevenness of the plate corresponding to the equal unevenness curve of the next standard line;
and controlling the pressing amount of the No. i straightening roller according to the equal-unevenness curve until straightening is finished.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides a method for controlling the pressing amount of a roller type straightener based on plate shape characteristics, which comprises the following steps: acquiring a standard distance and an actual distance from a plate type instrument to the surface of a plate; making a difference between the standard distance and the actual distance to obtain a plate unevenness value; taking the maximum value and the minimum value in the unevenness value of the plate as two end points of the unevenness interval; equally dividing the unevenness interval M, and drawing the measuring points with equal unevenness values into equal unevenness curves according to the unevenness values at the equally divided positions; and controlling the rolling reduction of the straightening roll according to the equal unevenness curve as the characteristic of the plate type. The method of the invention realizes that the straightening roller dynamically applies corresponding rolling reduction according to the plate type characteristics in the straightening process.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a flow chart of a method of the present invention;
FIG. 2 is a schematic diagram of the standard distance, actual distance and sheet flatness values of the present invention;
FIG. 3 is a schematic view of a roll leveler and a sheet material according to the present invention;
FIG. 4 is a schematic view of the present invention with the isoplanarity curves fully closed;
FIG. 5 is a schematic view of the present invention with the isoplanarity curve semi-closed;
FIG. 6 is a schematic diagram of the present invention when the iso-roughness curve is not closed.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a method for controlling the pressing amount of a roller type straightening machine based on plate type characteristics, which is used for realizing that a straightening roller dynamically applies corresponding pressing amount according to the plate type characteristics in the straightening process.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
FIG. 1 is a flow chart of the method of the present invention. Referring to fig. 1, a rolling force reduction control method of a roller leveler based on plate profile characteristics, the roller leveler comprising a plurality of upper row straightening rollers and a plurality of lower row straightening rollers, each of the straightening rollers being arranged in parallel in the moving direction of a plate material to be straightened, the rolling force reduction control method comprising:
s1: and acquiring the standard distance and the actual distance from the plate shape instrument to the surface of the plate.
S2: and obtaining the unevenness value of the plate by taking the difference between the standard distance and the actual distance.
Specifically, the standard distance from the plate shape instrument to the reference surface of the plate is set to be HaThe actual distance is the data transmitted by the plate shape instrument, namely the height H reflected to the measuring point on the plate when the plate shape instrument vertically scans the platebThe unevenness H of the sheet is Ha-HbAs shown in fig. 2.
S3: and selecting the maximum value and the minimum value from the unevenness values of the plates as two end points of an unevenness interval.
S4: and equally dividing the unevenness interval M, and drawing the measuring points with equal unevenness values into an equal unevenness curve according to the unevenness values at the equally divided positions.
Specifically, the unevenness interval is [ h ]min,hmax]Wherein h ismaxRepresents the maximum value, h, of the unevenness values of the sheetminAnd expressing the minimum value in the unevenness values of the plates, and dividing the unevenness interval into M parts, wherein M is a positive integer, and the lengths of all the parts are equal.
The measurement points corresponding to each portion of the unevenness values are drawn into an equal unevenness curve, and each portion may include a plurality of different unevenness values of the sheet material, and the unevenness value corresponding to the equal unevenness curve may be an average value of the unevenness values of each portion of the sheet material, or a value with the largest occurrence frequency among the unevenness values of each portion of the sheet material, but is not limited to the above two methods. Therefore, an equal unevenness curve chart corresponding to the plate defects can be obtained.
S5: determining the screw-down amount before correction of the No. i straightening roller, wherein the No. i straightening roller is the No. i straightening roller along the moving direction, i is 1,2,3,. N, N is the total amount of the straightening rollers, and when the No. i straightening roller is the No. 1 or No. N straightening roller, the screw-down amount is zero.
Namely S1＝0，SN＝0，S1Shows the rolling reduction before correction of No. 1 straightening roll, SNIs shown asThe rolling reduction before correction of the No. N straightening roll.
S6: according to the formula
Figure BDA0002491232890000051
Calculating the corrected rolling reduction of the No. i straightening roll, wherein SiThe rolling reduction before correction of No. i straightening roll is shown, H represents the thickness of the plate, HiAnd the unevenness value of the plate corresponding to the equal unevenness curve where the No. i straightening roller is located is shown.
The specific calculation formula of the rolling reduction before correction of the No. 2 and No. N-1 straightening rollers is as follows:
Figure BDA0002491232890000052
Figure BDA0002491232890000053
wherein σsDenotes yield strength, H denotes sheet thickness, E denotes modulus of elasticity, T denotes roll gap of straightening roll, n1、n2The values of the elastic modulus of the straightening rolls No. 2 and No. N-1 are expressed in multiples.
Specifically, the No. 2 straightening roll is corrected to obtain the rolling reduction S2The corresponding bending curvature value is a value corresponding to 5 times the elastic curvature value, i.e. n15, the pre-correction rolling reduction S of the No. N-1 straightening rollN-1The corresponding bending curvature value is 1.5 times the corresponding value of the elastic curvature value, namely n2Is 1.5.
The elastic curvature value calculation formula is as follows:
Figure BDA0002491232890000054
wherein σsDenotes the yield strength, E denotes the modulus of elasticity, ptThe press bending curvature is shown, and H is the sheet thickness.
The bending curvature calculation formulas corresponding to the No. 2 straightening roller and the No. N-1 straightening roller are as follows:
Figure BDA0002491232890000055
Figure BDA0002491232890000056
wherein T represents the roll gap of the straightening roll.
The calculation formula of the rolling reduction before correction of the No. 2 straightening roller and the No. N-1 straightening roller is as follows:
Figure BDA0002491232890000057
Figure BDA0002491232890000058
wherein σsDenotes the yield strength, E denotes the modulus of elasticity, ptDenotes the press bending curvature, T denotes the roll gap of the straightening rolls, H denotes the thickness of the sheet, n1、n2The respective multiples of the elastic modulus values of the No. 2 and No. N-1 straightening rolls are shown.
After the pre-correction rolling reduction of the No. 2 straightening roll and the No. N-1 straightening roll are known, the pre-correction rolling reduction of the No. i straightening roll is calculated.
The calculation of the screw-down amount before the correction of the No. i straightening roll comprises the following steps:
according to the formula
Figure BDA0002491232890000061
Calculating the screw-down quantity S before the correction of No. i straightening rolli，S2Draft before correction for No. 2 straightening, SN-1The screw-down amount before correction of the N-1 th straightening roll is the upper row straightening roll, i is 4,6, 8 … … N-3, and has a positive value, and the direction is downward, as shown in fig. 3.
The calculation of the screw-down amount before the correction of the No. i straightening roll further comprises the following steps:
according toFormula (II)
Figure BDA0002491232890000062
Calculating the screw-down quantity S before the correction of No. i straightening rolliThe number i of the straightening rollers is lower row of straightening rollers, i is 3,5,7 … … N-2, Si-1And Si+1The two upper straightening rollers adjacent to the No. i straightening roller respectively correct the front rolling reduction, the value of the front rolling reduction is a negative value, and the direction is upward.
When the plate is in a flat state, namely the unevenness is 0, the pressing amount of the No. i straightening roller before correction is unchanged, namely the pressing amount before correction is also the correction pressing amount, when the plate has defects such as medium waves, single-side waves, double-side waves, buckling and the like, the unevenness value is no longer 0, namely when the plate is no longer in the flat state, the pressing amount of the No. i straightening roller is compensated according to the unevenness value, so that the correction pressing amount of the No. i straightening roller is:
Figure BDA0002491232890000063
wherein S isiThe rolling reduction before correction of No. i straightening roll is shown, H represents the thickness of the plate, HiAnd the unevenness value of the plate corresponding to the equal unevenness curve where the No. i straightening roller is located is shown.
S7: and controlling the rolling reduction of the No. i straightening roll by taking the equal unevenness curve as the characteristic of the plate type.
Specifically, fig. 4, 5, and 6 are schematic diagrams of the present invention in which the iso-roughness curves are fully closed, semi-closed, and fully-closed states, respectively, and refer to fig. 4 to 6, in which M indicates a straightening direction, G indicates a standard line, H indicates a head of the plate, O indicates an area, J indicates a tail of the plate, P indicates an iso-roughness curve number, a straight line is the standard line, and the curves are iso-roughness curves, respectively.
When the profile of the isoplanarity line is a fully closed profile during the bite of the straightening rolls into the sheet, as shown in FIG. 4. When the iso-roughness curve graph is a semi-closed graph or a totally unclosed graph, as shown in fig. 5 and 6, a standard line is drawn on the initial biting point and the straightening end point of the closed iso-roughness curve respectively, and a standard line is drawn on the unclosed iso-roughness curve only at the initial biting point.
Judging whether each equal unevenness curve is in a closed state, a semi-closed state or a totally-closed state, drawing a standard line for each equal unevenness curve, setting a straightening speed v of the straightening roll when the straightening roll moves from the head of a plate to the tail of the plate, adjusting the pressing amount of the ith straightening roll at the position to be the corrected pressing amount under the unevenness of the plate corresponding to the equal unevenness curve 1# of the standard line 1 ' when the straightening roll moves to a standard line, such as 1 ', gradually adjusting the ith straightening roll at the position to be the corrected pressing amount under the unevenness of the plate corresponding to the equal unevenness curve 2# of the next standard line, such as 2 ', when the straightening roll gradually moves from the current standard line 1 ' to the next standard line 2 ', and sequentially controlling the pressing amount of the straightening roll according to an equal unevenness curve graph as the defect characteristic of the plate type, until the plate straightening is finished.
The embodiment of the invention establishes a new rolling reduction calculation method by correcting on the basis of the existing rolling reduction calculation method, and dynamically adjusts the rolling reduction along with the change of the unevenness of the plate.
According to the embodiment of the invention, the unevenness data of the plate are collected through the plate type instrument, then the collected data are analyzed to obtain the equal unevenness curve chart, and corresponding pressing amount is dynamically applied according to different positions of the equal unevenness curve chart of the straightening roller in the straightening process.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core ideas; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims (2)

1. A method for controlling the pressing amount of a roller straightening machine based on plate shape characteristics, wherein the roller straightening machine comprises a plurality of upper row straightening rollers and a plurality of lower row straightening rollers, and each straightening roller is arranged in parallel in the moving direction of a plate to be straightened, and the method for controlling the pressing amount comprises the following steps:
acquiring a standard distance and an actual distance from a plate shape instrument to the surface of a plate;
making a difference between the standard distance and the actual distance to obtain a plate unevenness value;
selecting the maximum value and the minimum value from the unevenness values of the plates as two end points of an unevenness interval;
equally dividing the unevenness interval M, and drawing the measuring points with equal unevenness values into equal unevenness curves according to the unevenness values at the equally divided positions;
determining the screw-down amount of the ith straightening roller before correction, wherein the ith straightening roller is the ith straightening roller along the moving direction, i is 1,2,3,. N, N is the total amount of the straightening rollers, and when the ith straightening roller is the No. 1 or the No. N straightening roller, the screw-down amount is zero;
according to the formula
Figure FDA0003413887050000011
Calculating the corrected rolling reduction of the No. i straightening roll, wherein SiThe rolling reduction before correction of No. i straightening roll is shown, H represents the thickness of the plate, HiThe unevenness value of the plate corresponding to the equal unevenness curve where the No. i straightening roller is located is represented;
taking the equal unevenness curve as the characteristic of a plate type, and controlling the rolling reduction of the No. i straightening roll;
the calculation of the screw-down amount before the correction of the No. i straightening roll comprises the following steps:
according to the formula
Figure FDA0003413887050000012
Calculating the screw-down quantity S before the correction of No. i straightening rolli，S2The rolling reduction before correction of No. 2 straightening roll, SN-1The rolling reduction before correction of No. N-1 straightening rollThe number i of the straightening rolls is an upper row of straightening rolls, and in the case, i is 4,6, 8 … … N-3;
the calculation of the screw-down amount before the correction of the No. i straightening roll further comprises the following steps:
according to the formula
Figure FDA0003413887050000013
Calculating the screw-down quantity S before the correction of No. i straightening rolliThe No. i straightening roll is a lower row straightening roll, and in the process, i is 3,5,7 … … N-2, Si-1And Si+1Correcting the front rolling reduction for two upper row straightening rollers adjacent to the No. i straightening roller respectively;
the specific calculation formula of the screw-down amount before correction of the No. 2 and No. N-1 straightening rollers is as follows:
Figure FDA0003413887050000021
Figure FDA0003413887050000022
wherein σsDenotes yield strength, H denotes plate thickness, E denotes elastic modulus, T denotes roll gap of straightening roll, n1、n2The values of the elastic modulus of the straightening rolls No. 2 and No. N-1 are expressed in multiples.
2. The method for controlling the amount of rolling reduction of the roll leveler based on the plate shape characteristics as claimed in claim 1, wherein the controlling the amount of rolling reduction of the i-th leveling roll by using the equal unevenness curve as the plate shape characteristics comprises:
judging the state of each equal-unevenness curve, wherein the states comprise a closed state, a semi-closed state and a fully-closed state;
drawing a standard line according to the state of the equal unevenness curve;
when the straightening roller gradually moves from the previous standard line to the next standard line according to the set straightening speed v, adjusting the pressing amount of the No. i straightening roller at the position to be the corrected pressing amount under the unevenness of the plate corresponding to the equal unevenness curve of the next standard line;
and controlling the pressing amount of the No. i straightening roller according to the equal-unevenness curve until straightening is finished.
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